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AB and AC are tangents to a circle with centre O. A is the external point of the circle. The line AO intersect the chord BC at D. The measure of the ∠BDO is
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- 60°
- 90°
- 45°
- 75°
- 60°
Correct Option: B
On the basis of question we draw a figure of a circle with centre O ,
AB = AC = tangents drawn from an exterior point
D is mid-point of BC and AD is perpendicular to BC.
∴ ∠BDO = 90°
